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<pre><span class="sourceLineNo">001</span>package com.palamida.util.collect;<a name="line.1"></a>
<span class="sourceLineNo">002</span><a name="line.2"></a>
<span class="sourceLineNo">003</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.3"></a>
<span class="sourceLineNo">004</span><a name="line.4"></a>
<span class="sourceLineNo">005</span>import java.util.ArrayDeque;<a name="line.5"></a>
<span class="sourceLineNo">006</span>import java.util.Collection;<a name="line.6"></a>
<span class="sourceLineNo">007</span>import java.util.Collections;<a name="line.7"></a>
<span class="sourceLineNo">008</span>import java.util.Iterator;<a name="line.8"></a>
<span class="sourceLineNo">009</span>import java.util.Queue;<a name="line.9"></a>
<span class="sourceLineNo">010</span><a name="line.10"></a>
<span class="sourceLineNo">011</span>import com.google.common.collect.Iterables;<a name="line.11"></a>
<span class="sourceLineNo">012</span>import com.google.common.collect.Iterators;<a name="line.12"></a>
<span class="sourceLineNo">013</span>import com.google.common.collect.Queues;<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>/**<a name="line.15"></a>
<span class="sourceLineNo">016</span> * Static utility methods which operate on or return {@link Queue}s.<a name="line.16"></a>
<span class="sourceLineNo">017</span> * <a name="line.17"></a>
<span class="sourceLineNo">018</span> * @author Zhenya Leonov<a name="line.18"></a>
<span class="sourceLineNo">019</span> * @see Queues<a name="line.19"></a>
<span class="sourceLineNo">020</span> */<a name="line.20"></a>
<span class="sourceLineNo">021</span>public class MoreQueues {<a name="line.21"></a>
<span class="sourceLineNo">022</span><a name="line.22"></a>
<span class="sourceLineNo">023</span>        private MoreQueues() {<a name="line.23"></a>
<span class="sourceLineNo">024</span>        }<a name="line.24"></a>
<span class="sourceLineNo">025</span><a name="line.25"></a>
<span class="sourceLineNo">026</span>        /**<a name="line.26"></a>
<span class="sourceLineNo">027</span>         * Creates an empty {@code ArrayDeque} with an initial capacity sufficient<a name="line.27"></a>
<span class="sourceLineNo">028</span>         * to hold the specified number of elements.<a name="line.28"></a>
<span class="sourceLineNo">029</span>         * <a name="line.29"></a>
<span class="sourceLineNo">030</span>         * @param numElements<a name="line.30"></a>
<span class="sourceLineNo">031</span>         *            lower bound on initial capacity of the deque<a name="line.31"></a>
<span class="sourceLineNo">032</span>         * @return an empty {@code ArrayDeque} with an initial capacity sufficient<a name="line.32"></a>
<span class="sourceLineNo">033</span>         *         to hold the specified number of elements<a name="line.33"></a>
<span class="sourceLineNo">034</span>         */<a name="line.34"></a>
<span class="sourceLineNo">035</span>        public static &lt;E&gt; ArrayDeque&lt;E&gt; newArrayDequeWithCapacity(final int numElements) {<a name="line.35"></a>
<span class="sourceLineNo">036</span>                return new ArrayDeque&lt;E&gt;(numElements);<a name="line.36"></a>
<span class="sourceLineNo">037</span>        }<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span>        /**<a name="line.39"></a>
<span class="sourceLineNo">040</span>         * Creates an {@code ArrayDeque} containing the specified initial elements.<a name="line.40"></a>
<span class="sourceLineNo">041</span>         * <a name="line.41"></a>
<span class="sourceLineNo">042</span>         * @param first<a name="line.42"></a>
<span class="sourceLineNo">043</span>         *            the first element<a name="line.43"></a>
<span class="sourceLineNo">044</span>         * @param rest<a name="line.44"></a>
<span class="sourceLineNo">045</span>         *            an array of additional elements, possibly empty<a name="line.45"></a>
<span class="sourceLineNo">046</span>         * @return an {@code ArrayDeque} containing the specified initial elements<a name="line.46"></a>
<span class="sourceLineNo">047</span>         */<a name="line.47"></a>
<span class="sourceLineNo">048</span>        public static &lt;E&gt; ArrayDeque&lt;E&gt; newArrayDeque(final E first, final E... rest) {<a name="line.48"></a>
<span class="sourceLineNo">049</span>                checkNotNull(first);<a name="line.49"></a>
<span class="sourceLineNo">050</span>                checkNotNull(rest);<a name="line.50"></a>
<span class="sourceLineNo">051</span>                final ArrayDeque&lt;E&gt; arrayDeque = new ArrayDeque&lt;E&gt;(rest.length + 1);<a name="line.51"></a>
<span class="sourceLineNo">052</span>                arrayDeque.add(first);<a name="line.52"></a>
<span class="sourceLineNo">053</span>                Collections.addAll(arrayDeque, rest);<a name="line.53"></a>
<span class="sourceLineNo">054</span>                return arrayDeque;<a name="line.54"></a>
<span class="sourceLineNo">055</span>        }<a name="line.55"></a>
<span class="sourceLineNo">056</span><a name="line.56"></a>
<span class="sourceLineNo">057</span>        /**<a name="line.57"></a>
<span class="sourceLineNo">058</span>         * Creates an {@code ArrayDeque} containing the elements returned by the<a name="line.58"></a>
<span class="sourceLineNo">059</span>         * specified iterator.<a name="line.59"></a>
<span class="sourceLineNo">060</span>         * <a name="line.60"></a>
<span class="sourceLineNo">061</span>         * @param elements<a name="line.61"></a>
<span class="sourceLineNo">062</span>         *            the iterator whose elements are to be placed into the deque<a name="line.62"></a>
<span class="sourceLineNo">063</span>         * @return an {@code ArrayDeque} containing the elements returned by the<a name="line.63"></a>
<span class="sourceLineNo">064</span>         *         specified iterator<a name="line.64"></a>
<span class="sourceLineNo">065</span>         */<a name="line.65"></a>
<span class="sourceLineNo">066</span>        public static &lt;E&gt; ArrayDeque&lt;E&gt; newArrayDeque(final Iterator&lt;? extends E&gt; elements) {<a name="line.66"></a>
<span class="sourceLineNo">067</span>                checkNotNull(elements);<a name="line.67"></a>
<span class="sourceLineNo">068</span>                final ArrayDeque&lt;E&gt; arrayDeque = new ArrayDeque&lt;E&gt;();<a name="line.68"></a>
<span class="sourceLineNo">069</span>                Iterators.addAll(arrayDeque, elements);<a name="line.69"></a>
<span class="sourceLineNo">070</span>                return arrayDeque;<a name="line.70"></a>
<span class="sourceLineNo">071</span>        }<a name="line.71"></a>
<span class="sourceLineNo">072</span><a name="line.72"></a>
<span class="sourceLineNo">073</span>        /**<a name="line.73"></a>
<span class="sourceLineNo">074</span>         * Attempts to insert the given elements into the specified queue. When<a name="line.74"></a>
<span class="sourceLineNo">075</span>         * using a capacity-restricted queue, some or all of the elements maybe<a name="line.75"></a>
<span class="sourceLineNo">076</span>         * rejected.<a name="line.76"></a>
<span class="sourceLineNo">077</span>         * &lt;p&gt;<a name="line.77"></a>
<span class="sourceLineNo">078</span>         * This method is generally preferable to<a name="line.78"></a>
<span class="sourceLineNo">079</span>         * {@link Collections#addAll(Collection, Object...)<a name="line.79"></a>
<span class="sourceLineNo">080</span>         * Collections.addAll(Queue, E...)}, which can fail to insert an element<a name="line.80"></a>
<span class="sourceLineNo">081</span>         * only by throwing an exception.<a name="line.81"></a>
<span class="sourceLineNo">082</span>         * <a name="line.82"></a>
<span class="sourceLineNo">083</span>         * @param queue<a name="line.83"></a>
<span class="sourceLineNo">084</span>         *            the specified queue<a name="line.84"></a>
<span class="sourceLineNo">085</span>         * @param elements<a name="line.85"></a>
<span class="sourceLineNo">086</span>         *            the elements to insert into the queue<a name="line.86"></a>
<span class="sourceLineNo">087</span>         * @return {@code true} if at least one elements was inserted into the<a name="line.87"></a>
<span class="sourceLineNo">088</span>         *         queue; {@code false} otherwise<a name="line.88"></a>
<span class="sourceLineNo">089</span>         * @throws ClassCastException<a name="line.89"></a>
<span class="sourceLineNo">090</span>         *             if the class of the specified element prevents it from being<a name="line.90"></a>
<span class="sourceLineNo">091</span>         *             inserted into this queue<a name="line.91"></a>
<span class="sourceLineNo">092</span>         * @throws NullPointerException<a name="line.92"></a>
<span class="sourceLineNo">093</span>         *             if the specified element is {@code null} and this queue does<a name="line.93"></a>
<span class="sourceLineNo">094</span>         *             not permit null elements<a name="line.94"></a>
<span class="sourceLineNo">095</span>         * @throws IllegalArgumentException<a name="line.95"></a>
<span class="sourceLineNo">096</span>         *             if some property of this element prevents it from being<a name="line.96"></a>
<span class="sourceLineNo">097</span>         *             inserted into this queue<a name="line.97"></a>
<span class="sourceLineNo">098</span>         */<a name="line.98"></a>
<span class="sourceLineNo">099</span>        public static &lt;E&gt; boolean offerAll(Queue&lt;? super E&gt; queue, E... elements) {<a name="line.99"></a>
<span class="sourceLineNo">100</span>                checkNotNull(queue);<a name="line.100"></a>
<span class="sourceLineNo">101</span>                checkNotNull(elements);<a name="line.101"></a>
<span class="sourceLineNo">102</span>                boolean result = false;<a name="line.102"></a>
<span class="sourceLineNo">103</span>                for (final E e : elements)<a name="line.103"></a>
<span class="sourceLineNo">104</span>                        result |= queue.offer(e);<a name="line.104"></a>
<span class="sourceLineNo">105</span>                return result;<a name="line.105"></a>
<span class="sourceLineNo">106</span>        }<a name="line.106"></a>
<span class="sourceLineNo">107</span><a name="line.107"></a>
<span class="sourceLineNo">108</span>        /**<a name="line.108"></a>
<span class="sourceLineNo">109</span>         * Attempts to insert the given elements into the specified queue. When<a name="line.109"></a>
<span class="sourceLineNo">110</span>         * using a capacity-restricted queue, some or all of the elements maybe<a name="line.110"></a>
<span class="sourceLineNo">111</span>         * rejected.<a name="line.111"></a>
<span class="sourceLineNo">112</span>         * &lt;p&gt;<a name="line.112"></a>
<span class="sourceLineNo">113</span>         * This method is generally preferable to<a name="line.113"></a>
<span class="sourceLineNo">114</span>         * {@link Iterators#addAll(Collection, Iterator) Iterators.addAll(Queue,<a name="line.114"></a>
<span class="sourceLineNo">115</span>         * Iterator)}, which can fail to insert an element only by throwing an<a name="line.115"></a>
<span class="sourceLineNo">116</span>         * exception.<a name="line.116"></a>
<span class="sourceLineNo">117</span>         * <a name="line.117"></a>
<span class="sourceLineNo">118</span>         * @param queue<a name="line.118"></a>
<span class="sourceLineNo">119</span>         *            the specified queue<a name="line.119"></a>
<span class="sourceLineNo">120</span>         * @param elements<a name="line.120"></a>
<span class="sourceLineNo">121</span>         *            the elements to insert into the queue<a name="line.121"></a>
<span class="sourceLineNo">122</span>         * @return {@code true} if at least one elements was inserted into the<a name="line.122"></a>
<span class="sourceLineNo">123</span>         *         queue; {@code false} otherwise<a name="line.123"></a>
<span class="sourceLineNo">124</span>         * @throws ClassCastException<a name="line.124"></a>
<span class="sourceLineNo">125</span>         *             if the class of the specified element prevents it from being<a name="line.125"></a>
<span class="sourceLineNo">126</span>         *             inserted into this queue<a name="line.126"></a>
<span class="sourceLineNo">127</span>         * @throws NullPointerException<a name="line.127"></a>
<span class="sourceLineNo">128</span>         *             if the specified element is {@code null} and this queue does<a name="line.128"></a>
<span class="sourceLineNo">129</span>         *             not permit null elements<a name="line.129"></a>
<span class="sourceLineNo">130</span>         * @throws IllegalArgumentException<a name="line.130"></a>
<span class="sourceLineNo">131</span>         *             if some property of this element prevents it from being<a name="line.131"></a>
<span class="sourceLineNo">132</span>         *             inserted into this queue<a name="line.132"></a>
<span class="sourceLineNo">133</span>         */<a name="line.133"></a>
<span class="sourceLineNo">134</span>        public static &lt;E&gt; boolean offerAll(Queue&lt;? super E&gt; queue, Iterator&lt;E&gt; elements) {<a name="line.134"></a>
<span class="sourceLineNo">135</span>                checkNotNull(queue);<a name="line.135"></a>
<span class="sourceLineNo">136</span>                checkNotNull(elements);<a name="line.136"></a>
<span class="sourceLineNo">137</span>                boolean result = false;<a name="line.137"></a>
<span class="sourceLineNo">138</span>                while (elements.hasNext())<a name="line.138"></a>
<span class="sourceLineNo">139</span>                        result |= queue.offer(elements.next());<a name="line.139"></a>
<span class="sourceLineNo">140</span>                return result;<a name="line.140"></a>
<span class="sourceLineNo">141</span>        }<a name="line.141"></a>
<span class="sourceLineNo">142</span><a name="line.142"></a>
<span class="sourceLineNo">143</span>        /**<a name="line.143"></a>
<span class="sourceLineNo">144</span>         * Attempts to insert the given elements into the specified queue. When<a name="line.144"></a>
<span class="sourceLineNo">145</span>         * using a capacity-restricted queue, some or all of the elements maybe<a name="line.145"></a>
<span class="sourceLineNo">146</span>         * rejected.<a name="line.146"></a>
<span class="sourceLineNo">147</span>         * &lt;p&gt;<a name="line.147"></a>
<span class="sourceLineNo">148</span>         * This method is generally preferable to<a name="line.148"></a>
<span class="sourceLineNo">149</span>         * {@link Iterables#addAll(Collection, Iterable) Iterables.addAll(Queue,<a name="line.149"></a>
<span class="sourceLineNo">150</span>         * Iterable)}, which can fail to insert an element only by throwing an<a name="line.150"></a>
<span class="sourceLineNo">151</span>         * exception.<a name="line.151"></a>
<span class="sourceLineNo">152</span>         * <a name="line.152"></a>
<span class="sourceLineNo">153</span>         * @param queue<a name="line.153"></a>
<span class="sourceLineNo">154</span>         *            the specified queue<a name="line.154"></a>
<span class="sourceLineNo">155</span>         * @param elements<a name="line.155"></a>
<span class="sourceLineNo">156</span>         *            the elements to insert into the queue<a name="line.156"></a>
<span class="sourceLineNo">157</span>         * @return {@code true} if at least one elements was inserted into the<a name="line.157"></a>
<span class="sourceLineNo">158</span>         *         queue; {@code false} otherwise<a name="line.158"></a>
<span class="sourceLineNo">159</span>         * @throws ClassCastException<a name="line.159"></a>
<span class="sourceLineNo">160</span>         *             if the class of the specified element prevents it from being<a name="line.160"></a>
<span class="sourceLineNo">161</span>         *             inserted into this queue<a name="line.161"></a>
<span class="sourceLineNo">162</span>         * @throws NullPointerException<a name="line.162"></a>
<span class="sourceLineNo">163</span>         *             if the specified element is {@code null} and this queue does<a name="line.163"></a>
<span class="sourceLineNo">164</span>         *             not permit null elements<a name="line.164"></a>
<span class="sourceLineNo">165</span>         * @throws IllegalArgumentException<a name="line.165"></a>
<span class="sourceLineNo">166</span>         *             if some property of this element prevents it from being<a name="line.166"></a>
<span class="sourceLineNo">167</span>         *             inserted into this queue<a name="line.167"></a>
<span class="sourceLineNo">168</span>         */<a name="line.168"></a>
<span class="sourceLineNo">169</span>        public static &lt;E&gt; boolean offerAll(Queue&lt;? super E&gt; queue, Iterable&lt;E&gt; elements) {<a name="line.169"></a>
<span class="sourceLineNo">170</span>                checkNotNull(queue);<a name="line.170"></a>
<span class="sourceLineNo">171</span>                checkNotNull(elements);<a name="line.171"></a>
<span class="sourceLineNo">172</span>                return offerAll(queue, elements.iterator());<a name="line.172"></a>
<span class="sourceLineNo">173</span>        }<a name="line.173"></a>
<span class="sourceLineNo">174</span>}<a name="line.174"></a>




























































</pre>
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